摘要
利用2002年2月—2007年12月海南地区DPS—4型测高仪探测数据,统计分析研究了海南地区磁暴期间电离层扩展F现象与D st指数下降值的关系。主要结果为:在海南地区磁暴期间,如果D st指数下降最快值出现在白天,午夜前扩展F现象的发生会被强烈地抑制;如果D st指数下降最快值出现在晚间,夜晚扩展F现象的发生会被激发。这是对海南站电离层观测数据分析,得到的一个新结果。本文还对磁暴期间电离层扩展F现象的发生与电离层扰动发电机电场、磁层渗透电场的关系进行了讨论。
A statistical analysis for the relationship between the spread-F and maximum rate of Dst index in the storm time in Hainan region has been put forward. The data were from the DPS-4 Digisonde during February 2002 to December 2007. The main results are as below：during the storm time in Hainan region, if the maximum rate of Dst index appears in the day time, the occurrence of spread-F at pre-midnight would be strongly suppressed. If the maximum rate of Dst index occurred in the evening, the occurrence of the spread F would be triggered. This is a new result based on the data analysis of ionospheric observation in Hainan station. The relationship between the occurrence of ionospheric spread F during the storm time and the two electric fields （ ionospheric disturbance dynamo electric field and magnetospheric prompt penetration electric field） has been discussed as well.
出处
《科学技术与工程》
2008年第18期5141-5144,共4页
Science Technology and Engineering
基金
解放军理工大学预研基金资助
